I just bought some .1uF/250v caps off eBay from a guy in China. I'm a bit suspicious of their dielectric being metallized polypropylene as claimed. Based on their size, they seem much more likely to be metallized polyester.

Here's a photo of a .1uF/50v Panasonic ECQ-P metallized pp cap. (the large one on the left with the crimped leads); and then a Seacor .1uF/250v (the blue one) which I thought was already suspiciously small, and the new one from China is the orange one in the middle.

But technology and manufacturing isn't static so who knows. Anyone care to comment on the probability these are really MKP?

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